Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 0878ece1d1ac40b3…

MALICIOUS

Office (OLE) / .XLS

2.56 MB Created: 2003-02-12 17:29:39 Authoring application: Microsoft Excel
MD5: 96a7e24f5a9718e88725b91915b3e857 SHA-1: d5937fa7c2d4455b041cb3b3eff287786a2cb083 SHA-256: 0878ece1d1ac40b3ad7130d761209aaf957c83901666dd9684b927aabe8fab60
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059 Command and Scripting Interpreter

The file contains a malicious VBA macro with an Auto_Open procedure, indicating it is designed to execute automatically upon opening. The macro utilizes obfuscated code and calls to Shell() and CreateObject() to download and execute a payload from the URL http://spiritweb.app.intra/N. This suggests a downloader or droppper functionality.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://spiritweb.app.intra/N
    • http://www.esri.com/software/arcexplorer/using_arcexplorer_java.pdf
    • http://www.esri.com/software/arcexplorer/using_arcexplorer_java.pdfB

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
45c2a6a7541a069076da87e49ee5a2899bb5c9c7bfbcdea07bc80937b1b3823f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 916510 bytes

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